Danny Devitos Limoncello Recipe??

Hello. Would anyone know the recipe for his limoncello? I am trying to get someone a gift but the 2 websites in the world that sell his bottle still don’t deliver it to my country. So I had the idea of making it myself and putting it in the bottle I got on ebay. Unfortunately, I am having trouble finding the recipe so I was wondering if anyone here knew where to find it or at least something close to it?